CN106500106A - A kind of method detoxified to leached-out chromium residue by utilization sintering technology - Google Patents
A kind of method detoxified to leached-out chromium residue by utilization sintering technology Download PDFInfo
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- CN106500106A CN106500106A CN201610833401.4A CN201610833401A CN106500106A CN 106500106 A CN106500106 A CN 106500106A CN 201610833401 A CN201610833401 A CN 201610833401A CN 106500106 A CN106500106 A CN 106500106A
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- Prior art keywords
- sintering
- leached
- chromium
- sieve
- slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of method detoxified to leached-out chromium residue by utilization sintering technology, chromium slag is sieved, then after being sufficiently mixed through batch mixer with Water Quenching Slag and coke powder, add water and make granule, equably it is distributed on pallet, ensure that mixture particle is paved and is covered with pallet to be sintered, control firing temperature is at 1100 DEG C 1200 DEG C；Sintering bellows vacuum cavitations are in 12kpa 13kpa；Below vertical sintering speed 18mm/min；Air blast cooling is carried out to high temperature finished product sintering deposit；Sieved, obtained finished product sintering deposit.Advantage is：Rational technology, energy consumption are low, cost-effective, realize the harmless treatment of chromium slag, efficiency high of detoxifying, Cr in water logging sample6+Index is less than national standard, and suitable industrialization is processed on a large scale.
Description
Technical field
This technology belongs to leached-out chromium residue removing toxic substances field, and more particularly to one kind is detoxified to leached-out chromium residue using sintering technology
Method, it be a kind of adopt sintering process using carbonaceous reducing agent and additive, by the Cr in chromium slag6+It is converted into Cr3+, and
Reach the method for meeting national solid waste discharge standard.
Background technology
The leached-out chromium residue that the chromium salt factory of China, crome metal factory discharge, due to value less, major part is deposited in dew
My god.Air storage chromium slag, through rainwater shower after, substantial amounts of hexavalent chromium is penetrated in soil, pollutes surface water and groundwater,
Also rivers and lake are polluted simultaneously, and then is harmed the crops and aquatic products and people and poultry health；Dust containing Cr VI flies away
To in air, all there are extremely strong carcinogenesis to the respiratory tract of human body, digestive tract, skin, mucosa.Even if to air storage
Chromium slag adopts Anti-seeping technology, can not fundamentally solve pollution problem.
In recent years, due to the attention of national environmental protection department, China occurs in that many chromium residue detoxifying technology, but great majority removing toxic substances
Technology has used other raw materials a large amount of, chromium slag only to account for a small amount of composition, and raw materials consumption is big, detoxifies less efficient, and processing cost is high,
It is unfavorable for that industrialization is processed on a large scale.
Content of the invention
It is low that the technical problem to be solved is to provide a kind of energy consumption, cost-effective, detoxifying effect good utilisation
The method detoxified to leached-out chromium residue by sintering technology.
The present invention technical solution be：
A kind of method detoxified to leached-out chromium residue by utilization sintering technology, which comprises the concrete steps that：
1st, leached-out chromium residue screening
Chromium slag is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
The granularity of chromium slag determines response speed, and the bigger reaction of chromium slag particle degree is slower, otherwise granularity is less, and bed permeability is poor, matches somebody with somebody
Jiao's amount is improved, and sintering time extends, and causes sintering machine production capacity to reduce, and therefore needs 50 mesh -3mm of control chromium slag particle degree to be advisable；
2nd, dispensing is mixed
By chromium slag, additive, reducing agent (70-90) in mass ratio：(10-30)：15 dispensings, the additive are Water Quenching Slag, also
Former agent is coke powder；
Another factor of decision reduction effect is that chromium slag sufficiently need to be mixed with each components such as Water Quenching Slag, coke powders, to keep good
Good contact；
Compound is obtained through batch mixer after being sufficiently mixed, and add water the mixture particle for making that granularity is 5mm-8mm, and controls pellet moisture
For 6%-7%；
3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Control firing temperature is at 1100 DEG C -1200 DEG C；Sintering bellows vacuum cavitations
In 12kpa-13kpa；Below vertical sintering speed 18mm/min；
In sintering process, reducing agent C, CO are by the Cr in chromium slag6+It is reduced to Cr3+, with the rising of temperature, on reduction rate is rapid
Rise；Under the high temperature conditions, additive generates low melting point eutectic with the reaction of chromium slag, and compound is enriched into molten condition, generation
Liquid phase, forms the sintering deposit with some strength after cooling；
Removing toxic substances reaction in chromium slag sintering process：
2C+O2→2CO↑；
2Na2CrO4+3CO→2NaCrO2+Na2CO3+2CO2↑；
2CaCrO4+3CO→Ca(CrO2)2+CaO+3CO2↑；
4Na2CrO4+3C→4NaCrO2+2Na2CO3+CO2↑；
4CaCrO4+3C→2Ca(CrO2)2+2CaO+3CO2↑；
4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit, storage and movement requirement is made up to；
5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
The material of 5mm-20mm is finished product ore deposit as grate-layer material during cloth, the material on sieve more than 20mm, is transported to stock ground by belt.
Further, the chromium slag is the industrial residue for having calcium baked for producing crome metal to produce.
Further, the additive is discarded Water Quenching Slag when silicomangan is produced.
Further, there is the redox reaction of complexity in sintering process, in order to strengthen the also Primordial Qi in sintering process
Atmosphere, controls air quantity in 50m by sintering the main exhauster throttle opening of bellows3/m2Below min, is reduced or avoided back reaction,
Make Cr3+Generation secondary oxidation.
Further, during sintering, the red bed of material of sinter section is controlled in below 150mm, it is ensured that compound is burned, grill thoroughly.
Beneficial effects of the present invention：
Rational technology, energy consumption are low, cost-effective, using sintering process in high temperature and reducing atmosphere, by six in chromium slag
Valency chromium is reduced to trivalent chromium, realizes the harmless treatment of chromium slag, efficiency high of detoxifying, and sintering process can be by Cr6+Fully reduce, into
Cr in product mineral water leaching sample6+Index is less than national standard (less than 5PPm), and outdoor storage is after 197 days, Cr in sintering deposit6+Leach poison
Also below national standard, suitable industrialization is processed property analysis indexes on a large scale.
Description of the drawings
Fig. 1 is the process chart of the present invention.
Specific embodiment
Embodiment
1 feed components content table of table
A kind of method detoxified to leached-out chromium residue by utilization sintering technology, which comprises the concrete steps that：
1st, leached-out chromium residue screening
As shown in figure 1, being sieved chromium slag (industrial residue for having calcium baked for producing crome metal to produce), it is 50 to choose granularity
The chromium slag of mesh -3mm；
2nd, dispensing is mixed
Discarded Water Quenching Slag (composition such as table 1), coke powder (70- in mass ratio when chromium slag (composition such as table 1), silicomangan are produced
90)：(10-30)：15 dispensings；Compound is obtained through batch mixer after being sufficiently mixed, and add water the compound for making that granularity is 5mm-8mm
Grain, and pellet moisture is controlled for 6%-7%；
3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Control firing temperature is at 1100 DEG C -1200 DEG C；Sintering bellows vacuum cavitations
In 12kpa-13kpa；Below vertical sintering speed 18mm/min；The red bed of material of sinter section is controlled in below 150mm, to guarantee to mix
Close material burned, grill thoroughly；
There is the redox reaction of complexity in sintering process, in order to strengthen the reducing atmosphere in sintering process, by sintering wind
The main exhauster throttle opening control air quantity of case is in 50m3/m2Below min, is reduced or avoided back reaction, makes Cr3+Generation is secondary
Oxidation；
4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit, storage and movement requirement is made up to, cooling residual heat can be used as hot blast
Sintering；
5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
The material of 5mm-20mm is finished product sintering deposit as grate-layer material during cloth, the material on sieve more than 20mm, is transported to by belt
Stock ground.
Embodiment 1
1st, leached-out chromium residue screening
Chromium slag (industrial residue for having calcium baked for producing crome metal to produce) is sieved, the chromium that granularity is 50 mesh -3mm is chosen
Slag；
2nd, dispensing is mixed
Discarded Water Quenching Slag (composition such as table 1), coke powder in mass ratio 80 when chromium slag (composition such as table 1), silicomangan are produced：
20：15 dispensings；After being sufficiently mixed through batch mixer compound, add water the mixture particle for making that granularity is 5mm-8mm, and controls
Grain moisture is 7%；
3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Control firing temperature is at 1100 DEG C -1200 DEG C；Sintering bellows vacuum cavitations
In 13kpa；Below vertical sintering speed 18mm/min；The red bed of material of sinter section is controlled in below 150mm, to guarantee that compound burns
Well, grill thoroughly；
There is the redox reaction of complexity in sintering process, in order to strengthen the reducing atmosphere in sintering process, by sintering wind
The main exhauster throttle opening control air quantity of case is in 50m3/m2Below min, is reduced or avoided back reaction, makes Cr3+Generation is secondary
Oxidation；
4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit, storage and movement requirement is made up to；
5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
Used as grate-layer material during cloth, the material on sieve more than 20mm is finished product sintering deposit, after testing, Cr to the material of 5mm-20mm6+Contain
Measure as 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Embodiment 2
1st, leached-out chromium residue screening
As shown in figure 1, being sieved chromium slag (composition such as table 1), the chromium slag that granularity is 50 mesh -3mm is chosen；
2nd, dispensing is mixed
Discarded Water Quenching Slag (composition such as table 1), coke powder in mass ratio 90 when chromium slag, silicomangan are produced：10：15 dispensings；Through
Batch mixer be sufficiently mixed after compound, add water the mixture particle for making that granularity is 5mm-8mm, and control pellet moisture and be
6.5%；
3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Lighted a fire using air and electric furnace coal gas, control firing temperature exists
1100℃-1200℃；Sintering bellows vacuum cavitations are in 12kpa-13kpa；Below vertical sintering speed 18mm/min；Sinter section
The red bed of material is controlled in below 150mm, to guarantee that compound is burned, grill thoroughly；
There is the redox reaction of complexity in sintering process, in order to strengthen the reducing atmosphere in sintering process, by sintering wind
The main exhauster throttle opening control air quantity of case is in 50m3/m2Below min, is reduced or avoided back reaction, makes Cr3+Generation is secondary
Oxidation；
4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit, storage and movement requirement is made up to, cooling residual heat can be used as hot blast
Sintering heat；
5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
Used as grate-layer material during cloth, the material on sieve more than 20mm is finished product sintering deposit, after testing, Cr to the material of 5mm-20mm6+Contain
Measure as 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Embodiment 3
1st, leached-out chromium residue screening
Chromium slag (having calcium roasting) is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
2nd, dispensing is mixed
Discarded Water Quenching Slag, coke powder in mass ratio 70 when chromium slag, silicomangan are produced：30：15 dispensings；Fully mix through batch mixer
Compound is obtained after conjunction, and add water the mixture particle for making that granularity is 5mm-8mm, and controls pellet moisture for 6%；
3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Control firing temperature is at 1100 DEG C -1200 DEG C；Sintering bellows vacuum cavitations
In 12kpa；Below vertical sintering speed 18mm/min；The red bed of material of sinter section is controlled in below 150mm, to guarantee that compound burns
Well, grill thoroughly；
There is the redox reaction of complexity in sintering process, in order to strengthen the reducing atmosphere in sintering process, by sintering wind
The main exhauster throttle opening control air quantity of case is in 50m3/m2Below min, is reduced or avoided back reaction, makes Cr3+Generation is secondary
Oxidation；
4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit, storage and movement requirement is made up to；
5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
Used as grate-layer material during cloth, the material on sieve more than 20mm is finished product sintering deposit, after testing, Cr to the material of 5mm-20mm6+Contain
Measure as 0.004%, Cr6+(Leaching analysis)≤0.05%, is transported to stock ground by belt.
Compound (chromium slag and Water Quenching Slag) and each component content balance table in sintering deposit in 2 embodiment 3 of table
Chromium slag sintering deposit analytical data after stacking 197 days outside sintering deposit room in 3 table 2 of table
Knowable to table 1,3 data of table 2 and table, sintering process can be by Cr6+Fully reduce, Cr in finished product mineral water leaching sample6+Refer to
Mark is less than national standard (less than 5PPm), and outdoor storage is after 197 days, Cr in sintering deposit6+Leaching analysis indexes are also below state
Family's standard.
The specific embodiment of the present invention is these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications that within the spirit and principles in the present invention, is made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of method detoxified to leached-out chromium residue by utilization sintering technology, is characterized in that：
Comprise the following steps that：
1.1st, leached-out chromium residue screening
Chromium slag is sieved, the chromium slag that granularity is 50 mesh -3mm is chosen；
1.2nd, dispensing is mixed
By screened chromium slag, additive Water Quenching Slag, reducing agent coke powder according to mass ratio (70-90)：(10-30)：15 are matched somebody with somebody
Material, obtains compound through batch mixer after being sufficiently mixed, add water the mixture particle for making that granularity is 5mm-8mm, and controls pellet moisture
For 6%-7%；
1.3rd, cloth, igniting, sintering
Mixture particle is equably distributed on pallet, it is ensured that pallet, sintering feed are paved and be covered with to mixture particle
Layer THICKNESS CONTROL is in 450mm, grate-layer material thickness 80mm；Control firing temperature is at 1100 DEG C -1200 DEG C；Sintering bellows vacuum cavitations
In 12kpa-13kpa；Below vertical sintering speed 18mm/min；
1.4th, cool down
Air blast cooling is carried out to high temperature finished product sintering deposit；
1.5th, sieve
Sintering deposit after by cooling is sieved, and under one section of sieve sieve, ＜ 5mm materials sinter as cold being returned mine again, under two-stage nitration sieve sieve
Used as grate-layer material during cloth, the material on sieve more than 20mm is finished product ore deposit to the material of 5mm-20mm.
2. the method detoxified to leached-out chromium residue by the utilization sintering technology according to power requires 1, is characterized in that：The chromium slag
For the industrial residue for having calcium baked for producing crome metal to produce.
3. the method detoxified to leached-out chromium residue by the utilization sintering technology according to power requires 1, is characterized in that：The interpolation
Agent is discarded Water Quenching Slag when silicomangan is produced.
4. the method detoxified to leached-out chromium residue by the utilization sintering technology according to power requires 1, is characterized in that：Sintering bellows
Main exhauster Boiler pressure control in 50m3/m2·min.
5. the method detoxified to leached-out chromium residue by the utilization sintering technology according to power requires 1, is characterized in that：During sintering,
The red bed of material of sinter section is controlled in below 150mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109943712A (en) * | 2019-04-02 | 2019-06-28 | 青海际华江源实业有限公司 | A kind of chromite ore fine sintering method and sintering system |
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